The Easytem BT-021 dual thermometer features the latest technology to measure body temperature in just one second from the ear or forehead. Clinical researches have proven that the ear and forehead are accurate sites to measure body temperature because the ear drum temperature reflects the brain temperature and the forehead temperature is the same as that of the arterial blood supply under the skin. With BT-021, you can take your baby's temperature quickly, easily, safely and accurately at any time from either ear or forehead of your choice. The Easytem BT-021 makes the reading by measuring the heat through infrared light. This is convenient because you only have to put the device in the ear or sweep it along the forehead, push the button, and check the display for a virtual instantaneous reading. BT-021 takes a total of nine different measurements in one second and displays the highest reading to guarantee accuracy. All readings are displayed in easy-to-read LCD format. A beep signals the end of the cycle and the automatic memory function holds last ten readings for easy review and comparison. Also, the thermometer provides readings in both Fahrenheit and Celsius. For hygienic use and increased accuracy, probe covers are included in the package. Set includes: 1 infrared thermometer, 24 probe covers, forehead tip, storage case, instruction manual and 1 CR2032 battery.